San Diego Weather Radar
San Diego Live Weather
San Diego Live Weather Radar
San Diego Hourly Weather Forecast
San Diego 7-Day Weather Forecast
San Diego Weather Overview
San Diego sits at the southwestern corner of California, where the Pacific Ocean keeps temperatures mild year-round. The NWS San Diego office (WFO SGX) covers this coastal region — use the san diego weather radar to track Pacific storm systems that arrive between December and March, when the city receives most of its modest 10.34 inches of annual rainfall. Outside winter, the san diego weather radar typically shows clear skies, but that calm can shift fast.
Wildfires are San Diego's defining weather threat. Santa Ana winds — hot, dry offshore gusts funneling through mountain passes — can drive fire at extraordinary speed. The Cedar Fire of October 2003 burned 273,246 acres and destroyed over 2,200 homes, the largest wildfire in California at the time. The Witch Creek Fire (2007) forced 500,000 residents to evacuate San Diego County, causing $1.14 billion in insured damage. Watching san diego weather radar alongside wind data gives residents early warning when Santa Ana conditions develop.
Flash flooding is a secondary risk the san diego weather radar captures in real time — when rare heavy rain hits canyons and urban areas, runoff concentrates fast. Santa Ana-driven heat can push inland temps past 100°F; NOAA records San Diego's all-time high at 111°F on September 26, 1963. The 1916 Great Flood destroyed all but two of the city's 112 bridges. Check san diego weather radar to track both wildfire smoke events and flash flood conditions across the county.
San Diego Weather Risks & Safety
Wildfire Smoke Risk
Wildfire smoke drifts into San Diego even when the fires are hundreds of miles away. Upper-level winds carry smoke plumes that turn skies hazy and push the Air Quality Index into unhealthy territory. Radar can't detect smoke directly, but it shows the wind patterns and incoming fronts that determine whether smoke lingers over San Diego or gets pushed out. If you have asthma or respiratory issues, check the AQI alongside the radar during wildfire season.
Flash Flood Risk
The terrain around San Diego funnels rainfall fast — canyon drainages, dry washes, and paved surfaces concentrate water into flows that can sweep away vehicles within minutes. The radar shows real-time rainfall rates, so you can see where the heaviest rain is falling and whether flash flood conditions are building near you. When a flash flood warning hits the San Diego area, move to higher ground immediately. Don't wait to see the water rise.
Extreme Heat Risk
Summers in San Diego get dangerously hot — heat indices regularly push past 100°F, and heat waves can last for weeks. When the radar shows clear skies with no storm activity for days, that usually means the heat is building. Outdoor workers, elderly residents, and anyone without reliable AC are most at risk. Stay hydrated, avoid outdoor activity during peak afternoon hours, and check on neighbors who might be struggling.
How to Use San Diego Weather Radar
Open the San Diego radar map
Pull up the live radar display covering San Diego County from the coast to the mountains. During Santa Ana wind events, zoom toward inland valleys like El Cajon and Santee where wildfire smoke and heat build fastest. The precipitation layer shows incoming Pacific storm bands during winter months.
Check wind patterns alongside radar
During wildfire season, watch the wind overlay on the San Diego radar map. Offshore Santa Ana winds funneling through mountain passes like Cajon and Campo signal elevated fire weather danger. WFO SGX issues Red Flag Warnings when Santa Ana conditions combine with low humidity — check these warnings before outdoor plans.
Track winter storm rainfall
San Diego gets the bulk of its 10.34 inches of annual rain between December and March. Use the radar animation to watch Pacific systems move in from the southwest and monitor rainfall intensity over canyon areas prone to flash flooding. Heavy rain over burn scars from recent wildfires can trigger debris flows.
Review the hourly and 7-day forecast
Check the hourly outlook for temperature swings between the coast and inland neighborhoods — San Diego's marine layer can mean 65°F at the beach and 95°F in El Cajon on the same day. The 7-day view helps plan around wildfire smoke episodes and the December-March rainy season.
Who Benefits from San Diego Weather Radar
Commuters & Drivers
Drivers on I-8 and SR-163 get early radar warning of coastal fog, flash flooding, and wildfire smoke reducing visibility.
Outdoor Enthusiasts
Hikers at Torrey Pines State Reserve and Mission Trails — check radar before canyon trails during winter rain and Santa Ana events.
Event Planners & Families
Event planners at Petco Park and the Del Mar Fairgrounds — radar shows exactly when rare Pacific rain systems arrive.
Outdoor Workers
Construction and landscaping crews across San Diego County — radar flags Red Flag fire weather days and flash flood watches.